The vampiric folklore of Eastern Europe, in which the undead derive sustenance from the blood of living beings, attests to the mythological power of blood as well as to fears about contamination through blood.

The study of blood, the blood-forming organs, and blood-related diseases is referred to as hematology, a branch of biology (physiology), pathology, clinical laboratory, internal medicine, and pediatrics.

Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.Mar 7, 2009

Blood from the body flows:to the superior and inferior vena cava,then to the right atrium.through the tricuspid valve.to the right ventricle.through the pulmonic valve.to the pulmonary artery.to the lungs.

The right side of your heart receives oxygen-poor blood from your veins and pumps it to your lungs, where it picks up oxygen and gets rid of carbon dioxide. The left side of your heart receives oxygen-rich blood from your lungs and pumps it through your arteries to the rest of your body.

The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium. The pulmonary artery channels oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream. The pulmonary veins bring oxygen-rich blood to the left atrium.

1. The pulmonary veins carry oxygen-rich blood from the lungs to the left side of the heart so it can be pumped to the body. 2. The superior and inferior vena cavae are large veins that carry oxygen-poor blood from the body back to the heart.Feb 10, 2016

The arteries (red) carry oxygen and nutrients away from your heart, to your body's tissues. The veins (blue) take oxygen-poor blood back to the heart. Arteries begin with the aorta, the large artery leaving the heart. They carry oxygen-rich blood away from the heart to all of the body's tissues.

What is the Rarest Blood Type? According to the American Red Cross the rarest is AB(-), present in 1% of the Caucasians, in African Americans it is even rarer. B(-) and O(-) are also very rare, each accounting for less than 5% of the world's population.Sep 28, 2012

There are various kinds of blood vessels:Arteries.Elastic arteries.Distributing arteries.Arterioles.Capillaries (the smallest blood vessels)Venules.Veins. Large collecting vessels, such as the subclavian vein, the jugular vein, the renal vein and the iliac vein.

If the egg your ovary releases every month isn't fertilized, the lining of your uterus sheds through your vagina. This is your period. The amount of blood that comes out of your body is called your menstrual flow. Whether your flow is light, moderate, or heavy, it's all considered normal.Jan 11, 2018

Yes, menstrual blood is real blood, but I can understand why you ask. Sometimes it just doesn't look like the blood when you have a cut. That's because in addition to losing 4 to 12 teaspoons of blood per cycle, you're also shedding the lining of your uterus. ... Yes, it is REALLY blood!

Sometimes you may notice that your menstrual blood becomes dark brown or almost black as you near the end of your period. This is a normal colour change. It happens when the blood is older and not being expelled from the body quickly. Temporary thick heavy flow isn't necessarily a cause for concern.

The females are larger than males, as with all baleen whales. The largest of the blue whales (150 tons) has a heart that weighs about 1,000 pounds (450 kg) and has 14,000 pounds (6,400 kg) of blood circulating in its body.

The ventral blood vessels are responsible for carrying blood to the back of the earthworm's body. Earthworms do not have lungs. They breathe through their skin. Oxygen and carbon dioxide pass through the earthworm's skin by diffusion.

Most snails' blood pigment is haemocyanin. Contrary to haemoglobin, used by vertebrates, haemocyanin works on a complex with copper as oxygen binding atom. That is why snail blood in its oxidised state appears pale blue in colour. ... Snails usually have two heart chambers, one atrium and one ventricle.

As said in the Blade movies vampires can't produce sufficient amounts of hemoglobin so they have to feed on human blood. In the The Vampire Chronicles, they do it because the life essence from the blood is the only way the spirit that animates them can replenish the energy it's using.Jan 12, 2012

The bone marrow produces stem cells, the building blocks that the body uses to make the different blood cells – red cells, white cells and platelets. The erythropoietin sends a message to the stem cells telling more of them to develop into red blood cells, rather than white cells or platelets.

Blood is a body fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. In vertebrates, it is composed of blood cells suspended in blood plasma.

Blood is a specialized body fluid. It has four main components: plasma, red blood cells, white blood cells, and platelets. Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues.

A blood transfusion is a safe, common procedure in which blood is given to you through an intravenous (IV) line in one of your blood vessels. Blood transfusions are done to replace blood lost during surgery or due to a serious injury.Feb 3, 2015

The next level of blood loss occurs with the Class 3 hemorrhage, which references loss of 30 to 40 percent of total blood volume. This could be around 3 to 4 pints of blood, for those keeping track. Blood transfusion is usually necessary with a hemorrhage of this magnitude, according to Alton.Sep 3, 2015

What's heavy for one woman may be normal for another. The average amount of blood lost during a period is 30 to 40 millilitres (ml), with 9 out of 10 women losing less than 80ml. Heavy menstrual bleeding is considered to be 60ml or more in each cycle. But it's not usually necessary to measure blood loss.

Menstrual bloodis mainly composed of blood, old parts of uterine tissue, cells from the mucus lining of the vagina and bacteria making up the vaginal flora. Menstrual blood is different from normal blood due to its composition and its physical properties.

Only female mosquitoes take blood. They use the protein and iron found in blood to make their eggs. Females feed on nectar and water, just like males do. How much blood does a female mosquito “drink” per bite?